# ***********************************************
# |docname| - Define the ``assignment`` directive
# ***********************************************
#
# Copyright (C) 2015  Paul Resnick
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
from __future__ import print_function

__author__ = "Paul Resnick"

from docutils import nodes
from docutils.parsers.rst import directives
from runestone.server.componentdb import (
    addAssignmentToDB,
    addAssignmentQuestionToDB,
    getCourseID,
    getQuestionID,
    get_HTML_from_DB,
)
from runestone.common.runestonedirective import RunestoneDirective, RunestoneNode
from datetime import datetime


def setup(app):
    app.add_directive("assignment", Assignment)
    app.add_node(AssignmentNode, html=(visit_a_html, depart_a_html))

    app.connect("doctree-resolved", process_nodes)
    app.connect("env-purge-doc", purge)


class AssignmentNode(nodes.General, nodes.Element, RunestoneNode):
    def __init__(self, content, **kwargs):
        """

        Arguments:
        - `self`:
        - `content`:
        """
        super(AssignmentNode, self).__init__(name=content["name"], **kwargs)
        self.a_components = content


def visit_a_html(self, node):
    pass


def depart_a_html(self, node):
    question_ids = node["a_components"]["question_ids"]
    basecourse = node["a_components"]["basecourse"]
    for q_id in question_ids:
        src = get_HTML_from_DB(q_id, basecourse)
        if src:
            self.body.append(src)
        else:
            self.body.append("<p>Missing HTML source for {}</p>".format(q_id))
            print(
                "No HTML source saved for {}; can't include that kind of question until code writing to HTML is implemented for that directive".format(
                    q_id
                )
            )


def process_nodes(app, env, docname):
    pass


def purge(app, env, docname):
    pass


class Assignment(RunestoneDirective):
    """
        .. assignment:
            :name: Problem Set 1
            :assignment_type: formative
            :questions: (divid_1 50), (divid_2 100), ...
            :deadline: 23-09-2016 15:30
            :points: integer
    """

    required_arguments = 0  # not a sphinx_id for these; just a name parameter
    optional_arguments = 0
    has_content = False
    option_spec = RunestoneDirective.option_spec.copy()
    option_spec.update(
        {
            "name": directives.unchanged,
            "assignment_type": directives.unchanged,
            "questions": directives.unchanged,
            "deadline": directives.unchanged,
            "points": directives.positive_int,
            "threshold": directives.positive_int,
            "autograde": directives.unchanged,
            "generate_html": directives.flag,
        }
    )

    def run(self):
        """
            .. assignment:
                :name: Problem Set 1
                :assignment_type: formative
                :questions: (divid_1 50), (divid_2 100), ...
                :deadline: 23-09-2016 15:30
                :points: integer
                :threshold: integer
                :autograde: visited
                :generate_html:
        """

        course_name = self.state.document.settings.env.config.html_context["course_id"]
        self.options["course_name"] = course_name

        ## No longer doing DB operations
        # course_id = getCourseID(course_name)
        # basecourse_name = self.state.document.settings.env.config.html_context.get('basecourse', "unknown")
        # self.options['basecourse'] = self.state.document.settings.env.config.html_context.get('basecourse', "unknown")

        name = self.options.get("name")  # required; error if missing

        unparsed = self.options.get("questions", None)
        question_names = []
        if unparsed:
            q_strings = unparsed.split(",")
            for q in q_strings:
                (question_name, points) = q.strip().split()
                question_names.append(question_name)
                # first get the question_id associated with question_name
                # question_id = getQuestionID(basecourse_name, question_name)
                # if question_id:
                #     addAssignmentQuestionToDB(question_id, assignment_id, points, autograde = autograde)
                # else:
                #     self.state.document.settings.env.warn(self.state.document.settings.env.docname, "Question {} is not in the database for basecourse {}".format(question_name, basecourse_name))
        else:
            self.state.document.settings.env.warn(
                self.state.document.settings.env.docname,
                "No questions for assignment {}".format(name),
            )
        self.options["question_ids"] = question_names

        if "generate_html" in self.options:
            assignment_node = AssignmentNode(self.options, rawsource=self.block_text)
            assignment_node.source, assignment_node.line = self.state_machine.get_source_and_line(
                self.lineno
            )
            return [assignment_node]
        else:
            return []
